On the stall flutter occurrence in a blade cascade set to turbine and compressor geometry

0559031 - ÚT 2024 FR eng C - Konferenční příspěvek (zahraniční konf.)
Procházka, Pavel P. - Šnábl, Pavel - Chindada, Sony - Bublík, O. - Uruba, Václav
On the stall flutter occurrence in a blade cascade set to turbine and compressor geometry.
EPJ Web of Conferences. Vol. 264. Cedex A: EDP Sciences, 2022, č. článku 01032. E-ISSN 2100-014X.
[EFM21 – International Conference Experimental Fluid Mechanics 2021 /15./. Liberec (CZ), 23.11.2021-26.11.2021]
Grant CEP: GA ČR(CZ) GA20-26779S
Institucionální podpora: RVO:61388998
Klíčová slova: stall flutter * blade cascade * PIV * frequency spectra
Obor OECD: Applied mechanics
https://www.epj-conferences.org/articles/epjconf/pdf/2022/08/epjconf_efm2022_01032.pdf

A blade cascade allowing free pitch movement of five blades was developed in Institute of Thermomechanics. This model is introduced to study the phenomenon of stall flutter existing in rotary bladed wheels of steam turbines and other devices. This article describes how to induce the stall flutter for prescribed boundary conditions (as inlet velocity, various angles of attack, etc.) and gives survey about flow field differences around the cascade set to both the turbine and the compressor geometry. This experimental research utilized time-resolved Particle Image Velocimetry (PIV) to measure and to evaluate statistical quantities of the wake behind the NACA0010 profiles of the cascade. Also dynamical analysis was performed in the form of Fast-Fourier transform and also phase-locked measurement was applied. Gained knowledge will be utilized to design advanced model of the cascade allowing stall flutter examination without the use of ball bearings.
Trvalý link: https://hdl.handle.net/11104/0350948